/*
 * Tencent is pleased to support the open source community by making Angel available.
 *
 * Copyright (C) 2017-2018 THL A29 Limited, a Tencent company. All rights reserved.
 *
 * Licensed under the Apache License, Version 2.0 (the "License"); you may not use this file except in
 * compliance with the License. You may obtain a copy of the License at
 *
 * https://opensource.org/licenses/Apache-2.0
 *
 * Unless required by applicable law or agreed to in writing, software distributed under the License
 * is distributed on an "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express
 * or implied. See the License for the specific language governing permissions and limitations under
 * the License.
 *
 */

package com.tencent.angel.graph.psf.neighbors.samplebyaliastable.samplealiastable;

import com.tencent.angel.ml.matrix.psf.get.base.PartitionGetResult;
import io.netty.buffer.ByteBuf;

public class PartGetNeighborAliasTableResult extends PartitionGetResult {
    private int partId;
    private long[][] nodeIdToNeighbors;

    public PartGetNeighborAliasTableResult(int partitionId, long[][] nodeIdToNeighbors) {
        this.partId = partitionId;
        this.nodeIdToNeighbors = nodeIdToNeighbors;
        assert (nodeIdToNeighbors != null);
    }

    public PartGetNeighborAliasTableResult() {
        this(-1, null);
    }

    public long[][] getNodeIdToNeighbors() {
        return nodeIdToNeighbors;
    }

    public void setNodeIdToNeighbors(
            long[][] nodeIdToNeighbors) {
        this.nodeIdToNeighbors = nodeIdToNeighbors;
    }

    public int getPartId() {
        return partId;
    }

    @Override
    public void serialize(ByteBuf output) {
        output.writeInt(partId);
        output.writeInt(nodeIdToNeighbors.length);
        for (int i = 0; i < nodeIdToNeighbors.length; i++) {
            if (nodeIdToNeighbors[i] == null) {
                output.writeInt(0);
            } else {
                output.writeInt(nodeIdToNeighbors[i].length);
                for (long value : nodeIdToNeighbors[i]) {
                    output.writeLong(value);
                }
            }
        }
    }

    @Override
    public void deserialize(ByteBuf input) {
        partId = input.readInt();
        int size = input.readInt();
        nodeIdToNeighbors = new long[size][];

        for (int i = 0; i < size; i++) {
            long[] neighbors = new long[input.readInt()];
            for (int j = 0; j < neighbors.length; j++) {
                neighbors[j] = input.readLong();
            }
            nodeIdToNeighbors[i] = neighbors;
        }
    }

    @Override
    public int bufferLen() {
        int len = 8;
        for (int i = 0; i < nodeIdToNeighbors.length; i++) {
            if (nodeIdToNeighbors[i] == null) {
                len += 4 ;
            } else {
                len += 4 ;
                len += 8 * nodeIdToNeighbors[i].length;
            }
        }
        return len;
    }
}
